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Aerobactin, but Not Yersiniabactin, Salmochelin, or Enterobactin, Enables the Growth/Survival of Hypervirulent (Hypermucoviscous) Klebsiella pneumoniae Ex Vivo and In Vivo

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Russo, Thomas A., Olson, Ruth, MacDonald, Ulrike, Beanan, Janet, Davidson, Bruce A.·2015·Infection and Immunity

Abstract

The siderophore aerobactin is the dominant siderophore produced by hypervirulent Klebsiella pneumoniae (hvKP) and was previously shown to be a major virulence factor in systemic infection. However, strains of hvKP commonly produce the additional siderophores yersiniabactin, salmochelin, and enterobactin. The roles of these siderophores in hvKP infection have not been optimally defined. To that end, site-specific gene disruptions were created in hvKP1 (wild type), resulting in the generation of hvKP1Δ iucA (aerobactin deficient), hvKP1Δ iroB (salmochelin deficient), hvKP1Δ entB (enterobactin and salmochelin deficient), hvKP1Δ irp2 (yersiniabactin deficient), and hvKP1Δ entB Δ irp2 (enterobactin, salmochelin, and yersiniabactin deficient). The growth/survival of these constructs was compared to that of their wild-type parent hvKP1 ex vivo in human ascites fluid, human serum, and human urine and in vivo in mouse systemic infection and pulmonary challenge models. Interestingly, in contrast to aerobactin, the inability to produce enterobactin, salmochelin, or yersiniabactin individually or in combination did not decrease the ex vivo growth/survival in human ascites or serum or decrease virulence in the in vivo infection models. Surprisingly, none of the siderophores increased growth in human urine. In human ascites fluid supplemented with exogenous siderophores, siderophores increased the growth of hvKP1Δ iucA , with the relative activity being enterobactin > aerobactin > yersiniabactin > salmochelin, suggesting that the contribution of aerobactin to virulence is dependent on both innate biologic activity and quantity produced. Taken together, these data confirm and extend a role for aerobactin as a critical virulence factor for hvKP. Since it appears that aerobactin production is a defining trait of hvKP strains, this factor is a potential antivirulence target.

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Crossref · 10.1128/iai.00430-15

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  • The elaboration and acquisition of the latter three siderophores are associated with the pathogenesis and hypervirulence of K. pneumoniae.

    “The elaboration and acquisition of the latter three siderophores are associated with the pathogenesis and hypervirulence of K. pneumoniae (1,44,53,54).”

    From Siderophore-mediated iron acquisition by <i>Klebsiella pneumoniae</i> (2024) · cites this paper as [54]

    The Abstract says hypervirulent K. pneumoniae commonly produces yersiniabactin, salmochelin, and enterobactin, but its experiments found that loss of these siderophores, individually or together, did not decrease virulence in the tested mouse infection models. It identifies aerobactin, rather than the other three, as a major virulence factor. No page number is available in our copy. (LLM, conf=0.88)

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  • Unlike FeEnt, FeAbn uptake was not inhibited by SCN, reinforcing its importance in the pathogenesis of hvKp1.

    “However, unlike FeEnt, FeAbn uptake was not inhibited by SCN, reinforcing its importance in the pathogenesis of hvKp1 (54).”

    From Siderophore-mediated iron acquisition by <i>Klebsiella pneumoniae</i> (2024) · cites this paper as [54]

    The Results passage on growth in ascites fluid and serum, together with the Discussion, supports aerobactin’s importance to hvKP1 under the conditions tested. But our copy does not report that SCN inhibits FeEnt uptake while leaving FeAbn uptake unaffected; searches for SCN, siderocalin, and uptake did not establish that comparison. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • FeGEnt does not adsorb well to siderocalin, which promotes the pathogenesis of clinical isolates of E. coli, K. pneumoniae, and Salmonella typhimurium in human and animal hosts.

    “The glucosylated ferric catecholate does not adsorb well to siderocalin ( Kumar et al., 2022 ), which promotes the pathogenesis of clinical isolates of E. coli, K. pneumoniae, and Salmonella typhimurium in human and animal hosts ( Russo et al., 2011 , 2015 ).”

    From Specificity and mechanism of TonB-dependent ferric catecholate uptake by Fiu (2024) · cites this paper as Russo et al., 2015

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  1. [18]18. M enterobactin, with the addition of 1.28 M yersiniabactin, and with 640 nM and 1.28 M aerobactin compared to growth in the absence of exogenous siderophore (*, P Ͻ 0.05/6, two-tailed unpaired t test). ulence revisited. Microbiology 157:3446 -3457. http://dx.doi.org/10.1099 /mic.0.050336-0.

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Authors
Russo, T. A., Olson, R., MacDonald, U., Beanan, J., & Davidson, B. A.
Affiliations
VA Western New York Healthcare System (US)
Venue
Infection and Immunity
Published
2015-08
Volume
83
Issue
8
Pages
3325-3333
ISSN
  • 0019-9567 (ISSN-L)
  • 1098-5522
OpenAlex
W2283434174
Cited by
305
References
49
Citations by year
2026: 32 · 2025: 32 · 2024: 34 · 2023: 33 · 2022: 56 · 2021: 28 · 2020: 25 · 2019: 16 · 2018: 24 · 2017: 11 · 2016: 13 · 2015: 1
FWCI
12.66
Type
journal article
Language
en
Open access
Locations
  • Infection and Immunity (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Veterans Affairs
  • National Institutes of Health (W81XWH)
  • National Institute of Allergy and Infectious Diseases (R21AI088318)
  • Telemedicine and Advanced Technology Research Center
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Endocrinology › Escherichia coli research studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Endocrinology › Enterobacteriaceae and Cronobacter Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Medicine › Antibiotic Resistance in Bacteria
Keywords
aerobactin, yersiniabactin, salmochelin, enterobactin, siderophores, hypervirulent Klebsiella pneumoniae, hypermucoviscous Klebsiella pneumoniae, virulence factors, iron acquisition, iucA, IRP2, entB, iroB, systemic infection, pulmonary infection, ascitic fluid, human serum, human urine
MeSH terms
Animals, Enterobactin, Glucosides, Humans, Hydroxamic Acids, Klebsiella Infections, Klebsiella pneumoniae, Male, Phenols, Thiazoles, Virulence, Siderophores, Microbial Viability, Mice, Young Adult

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